Sigma vs SIRUI
Updated July 2026 — Sigma leads on weight and build.
The Sigma lens offers better low-light performance and is more budget-friendly, while the SIRUI lens excels in cinematic features.
Why Sigma is better
Price
Sigma lens is $60 cheaper
Aperture
Sigma has a wider f/1.4 aperture
Durability
Sigma is dust and splash-proof
Why SIRUI is better
Cinematic Features
SIRUI offers anamorphic design
Autofocus
SIRUI has advanced eye-tracking autofocus
Field of View
SIRUI provides a wider cinematic perspective
Overall score
Specifications
| Spec | Sigma | SIRUI |
|---|---|---|
| Aperture | f/1.4 | T1.8 |
| Focal Length | 16mm | 20mm |
| Mount Type | Sony E | Sony E |
| Image Circle | N/A | 37mm |
| Autofocus | Hybrid | STM |
Dimension comparison
Price Comparison
The Sigma 16mm f/1.4 DC DN Contemporary Lens is priced at $539.00, while the SIRUI 20mm T1.8 Anamorphic Lens is slightly higher at $599.00. This makes the Sigma lens about 10% cheaper than the SIRUI lens, offering a more budget-friendly option for those looking for high-quality camera lenses. While both are premium products, the price difference could influence purchasing decisions, especially for enthusiasts or professionals who are cost-conscious.
Design and Build Quality
Both lenses exhibit compact designs, but they cater to different needs. The Sigma 16mm lens is compact and portable, making it ideal for nature and event photography. Its dust and splash-proof design enhances durability, which can be crucial for outdoor shooting conditions. On the other hand, the SIRUI 20mm lens is also lightweight, weighing just 480g, making it suitable for handheld shooting and gimbal work. Overall, while both lenses are designed for portability, the Sigma’s rugged build may appeal more to outdoor photographers.
Compatibility
When it comes to compatibility, the Sigma lens is explicitly designed for Sony E mount cameras, ensuring seamless integration with various models. It accommodates fast hybrid autofocus, making it a versatile choice for photographers. The SIRUI lens, while also compatible with Sony E mount cameras, is optimized for APS-C or Super 35 sensors. This means it can deliver excellent image quality across a broader range of shooting scenarios, making it particularly appealing for filmmakers and videographers.
Aperture and Low-Light Performance
The Sigma features a large f/1.4 aperture, which is exceptional for low-light performance, allowing for superb image quality in challenging lighting conditions. This makes it ideal for capturing sharp images during evening events or in dimly lit environments. Conversely, the SIRUI lens boasts a T1.8 aperture, which, while slightly smaller, still allows significant light entry. This lens excels in creating a soft bokeh effect, thus providing remarkable depth of field control. Both lenses perform well in low light, but the Sigma has a slight edge due to its wider aperture.
Focusing Mechanism
The Sigma lens features a fast hybrid autofocus system, ensuring smooth and precise focusing, which is especially beneficial during video shooting. This feature is complemented by its stepping motor, providing quiet operation. The SIRUI lens also offers autofocus capabilities powered by a precision STM stepping motor, with eye-tracking features and an AF/MF switch for added creative control. While both lenses provide excellent focusing mechanisms, the SIRUI's advanced features may cater more to video creators looking for versatility in their shooting conditions.
Image Quality and Coverage
In terms of image quality, the Sigma 16mm lens is designed to deliver exceptional clarity, thanks to its 16 elements arranged in 13 groups. This configuration ensures that every shot, especially in landscapes and event photography, is sharp and vibrant. The SIRUI lens, with its 1.33x squeeze factor, provides a cinematic 2.35:1 widescreen ratio, creating immersive visuals without cropping. The 37mm image circle of the SIRUI lens ensures excellent coverage, making it a fantastic choice for filmmakers. While both lenses excel in image quality, they cater to different visual styles—Sigma for photography and SIRUI for cinematic video work.
Intended Use and Target Audience
The Sigma lens is perfect for photographers focusing on nature and events, thanks to its portability and superior low-light capabilities. It’s an ideal choice for those capturing moments in various lighting conditions. Conversely, the SIRUI lens is tailored for filmmakers and video creators, offering features that enhance cinematography, such as the anamorphic design and advanced autofocus capabilities. While both lenses are high-quality choices, their intended uses may lead consumers to prefer one over the other based on their specific photography or filmmaking needs.
Which should you buy?
Choosing between the Sigma 16mm f/1.4 DC DN Contemporary Lens and the SIRUI 20mm T1.8 Anamorphic Lens ultimately depends on your specific needs. If you're a photographer focused on nature or events and require a lens with exceptional low-light performance and durability, the Sigma lens at $539.00 is a compelling option. However, if you are a videographer looking to create cinematic visuals with advanced autofocus features and a unique widescreen ratio, the SIRUI lens priced at $599.00 may be worth the extra investment. Each lens has its strengths, making the decision a matter of intended use and personal preference.

